Ribbed tumbler



FIG. 1 is a front view of a ribbed tumbler showing mmy new design;

FIG. 2 is a top view thereof;

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2; and,

FIG. 4 is a bottom view thereof. 

The ornamental design for a ribbed tumbler, as shown and described. 